<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <style type="text/css">
			#rcorners4 {
				border-radius: 15px 50px 30px 50px;
				background: #8AC007;
				padding: 20px;
				width: 200px;
				height: 150px;
			}
			#rcorners5 {
				border-radius: 15px 50px 30px;
				background: #8AC007;
				padding: 20px;
				width: 200px;
				height: 150px;
			}
			#rcorners6 {
				border-radius: 15px 50px;
				background: #8AC007;
				padding: 20px;
				width: 200px;
				height: 150px;
			}

        </style>
    </head>
    <body>
    	<p>四个值 border-radius: 15px 50px 30px 50px</p>
    	<p id="rcorners4"></p>
    	<P>三个值 border-radius: 15px 50px 30px;</P>
    	<p id="rcorners5"></p>
    	<p>两个值 border-radius: 15px 50px;</p>
    	<p id="rcorners6"></p>
    </body>
</html>